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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa42c3e3836c06a9766399800eb90eb1f06f479133ef3c0a989e35c6b9ad82c8' 
  AND token = 'xFhyPXYrZBh2JXJhQi7pvr9Qa12xPPSfy9doII7gRXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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