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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3410cae0d91fee84d71fc36d5c8019b9c2e1f50faeeb65b2fe8d272d234b044' 
  AND token = 'z8qkbKKxlv8hZ35OMMB8MDs7EoVQYDH81R+MBVakxBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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