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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19912f37594bb299a60730c9ea5628c42e10176c18c0d1be20fe6018b221a449' 
  AND token = 'c7rjWrxRhUrbXkIu+HC/OqtBSL+bcMCs450lspDfeDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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