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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbe33f6a1e76836f733546e42e41cb20f560b387d701b9bc5febfe032f8b0a5' 
  AND token = '2gsoWZ0kSBaU66GKooRm0aw4c0lsup9ydztR7NMbLXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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