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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97c038bdcd6e44b93fd0b98234008e81b1967a42fc3463f9907c03ae8cf92e5' 
  AND token = 'sUfB23rQcIyp/zBxBQ/vGOo2Uqi31hyXliX+MLk2CzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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