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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1983aa9578b52e9c5df687fda69001ebb748da382a580b7b16a80b1184be9c91' 
  AND token = 'ewasFcWbkHPulHCjrmyzouEf/kh+9qUaJt03QeD10fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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