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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93e2bf977c79821a60993a44c72f06181685b26d10f4a2afeecd5aedd278584' 
  AND token = 'WrlNMhooVY5jj5bzVCmZCo4VGVamuNVdTlof6H02aoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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