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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b49879d635e687993d77fadc633148d0ebab547da7776c8743e48d9f3746f8a' 
  AND token = '3d0kVStooudMo1HFKwVaHYWn4B5QkEHIU9B5IK6Az7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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