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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229ea6166fe257aaa7917419547157b191adedb5ce7cf2c6cf49736e31a5162b' 
  AND token = 'Z8U4zmpeSNG6PIFujUa/f+8Y6LxA9BjNHiZcFrptM+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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