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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19ded69b3f7fdd38180f9d0aa988ecc336c7b0c34f9c4f9659cf22f8ef8ec6a' 
  AND token = 'lj0qrKL1thqGsktZW1kRdbGwGulvNZVto1EGgYxrgJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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