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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f579aae9fabcf7bc92c34ece69a1d4e1f9642bce760878d12b1677fa38db1d' 
  AND token = 'ZpIdssivWVvq39e6yb+hG5ABelbQTQpjGYEmq0R205U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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