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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb6934043cee6b8346fb41551f7850b0e35a558f815f20d58731d21102d077d' 
  AND token = 'vEZcOsZwAb/K/TDvog0Q6ZO+g+9LE773mQHyNXqEwuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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