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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66c30f2961a07d91aaa457e4889beb295900a27f562afac316c21e0c5aad6e9' 
  AND token = 'PJ6imwe2txZjFAhmvgJO6W0g++sfk9fkFbz6LAqQLUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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