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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc6deda4c5f27e67e6349f8edece81f9a315d141a600659b0e9e8cd60659115' 
  AND token = '+gx5PsUsPYm6SKVhabTlXaBxE7YkAe4LWeL5VXTewOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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