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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925a26689166b2c44936640dc986db35a659efc2314a74ba50447b9369e2723c' 
  AND token = 'MUUjKIXe/VE9NtHycmzrvR2YoL/TiBD5rt/JNS5nQoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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