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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73ab694cdd3a1e03fde515bd6083a5fde6fe98710f882cf7031748aa9feed0e' 
  AND token = 'hxk9xiQSPTm40O0CZKu1Lydyvcy2ENKCZ4z9H7LHOgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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