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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61744b5bce1d2a74d325009007e1116d0ffd4920d0ddfcc3228b1a524312557e' 
  AND token = '8Oc7yzeXkiUEr78HDO5qB7xY6nIKHniTWA3FpbZH2uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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