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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ade34c238b0c672c2d2a503c0a0a8e1a4cb88a3fc7a186bd5860a7bdb0ff3d' 
  AND token = 'ndQZA0ypbhtA3+5kEmQ7gDSbKbYO9C9R7Q9QitMbbZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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