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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd57591114796e849e0c9b94b0efd0c9eb99794cf3bf967fa5431b0db335878' 
  AND token = 'jAzbFILssk5760DrjrEN20CO4kKDxRrtAriz3i9F1O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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