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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac7fc1e4d3b786173641c4cdbbd7e359e1a196abef0a18365a3b0725e6dec6a' 
  AND token = '+0/YQ+tUodw8Nsk6esL/cNVJatx2HWG+290doYmNPNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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