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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ea661daace324cea0d4248c7e6ac2f553040937aba1e555ad924c78db57aec' 
  AND token = 'b5gOzou4W8WPr/p3Nu3ZBPXcLg+59R+A3FUCQv4J+8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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