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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4d632646e5e49b84a267a29030453d61b682675dee676cfb9a964fb0fd44ce' 
  AND token = 'F42QzBFhcFX3g/0pMNUYZGf48YTQVsvAEaJfq4fkoSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}