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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c55a052a15725e9bbb004b650d7625cc89db69d91732c9ce62fff988bde49e' 
  AND token = 'ojyyrs08Kwgdeh9ZtUP8daZAVF9PIv5pTQxoA7GRUH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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