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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4880e6420be7337025f1524d708c057f171d7c6b84845e7e5fbf2bdcfbda59e7' 
  AND token = 'CCzdZ+k1tktq5YOqhl9VmP2SqaGUERyap5Keu0o2/cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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