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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d4f3a78bc9b1f526754e334cd4c12a1b38fbe1b15c905a68de5e755540c724' 
  AND token = 'FYAtiFfyL0tfsl2qRA7e6ztD3lgv72XXt2ygMQZkCI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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