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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39baabbc5d8b41a8333c24f7c02b36265090fe300bbe8a43c51e356f547a8882' 
  AND token = 'UT0v6o3r7fXfqpeLtFIBgPtUNoP8N29ef1EWo1vOwPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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