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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32708f40bad321c474b47ab0e25f4701b9ee7f7555bcc4e3b391e1e75fa81093' 
  AND token = 'sohLO6uEnaJLCTVBY9DxvuLMz1s25EefLdX6fa3LyDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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