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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0926a3b93b6ea28909ed667c2ec813f1b3e1a31d1fd8b46dcdf88b7031db0727' 
  AND token = 'u5UxoWKyFCrKJDw75dQKfqi8bpct9OwM6BD4gat60Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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