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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb296d591e6a19caa5b09bf0b812f774f437f8793b0b402cfb8414e46360f841' 
  AND token = 'M9B2NsppiaydxoxfRMkqIRHkHQ8VFr58y0OOtFW3PDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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