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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c796397572151a27563c71937b1c946a73fecf6c44a07e544f4b0673b3871586' 
  AND token = 'EnpR8ciS5IftpvOLBecF2E8rNrdjXxV8o1/R7AJ64kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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