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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7089ed4e0655ca40bca5c3a78b331fa80ea21c35fb4784b3c4fc6f564e77bc50' 
  AND token = '36eKaT7ggcy3+iybJmDJ6axHXoOXWyezSURsdDoyRwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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