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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2704af735d132d7ca0d74f835ad7fb4a37b2d39e4cff80e2a2165d43422a217' 
  AND token = 'f4HTZqprsaRZkkCvQ0heu0Yn1ah4Wc9JxQY30xH7VB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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