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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7eea832bcb8dc13b09d63c6b2b4987e607a15d62c7cecf56d0ff2f0aeb67d44' 
  AND token = 'oSqLO2Hhh/uTD4rNX4popp2ouys2cjy0WfgqqVaZNAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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