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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0930002d91c1170fa77306e15e37f414c27c7b3438b99d83a8b1454c133a36c4' 
  AND token = 'Z08QbYWyMB9QHdIL1XPZdvrOJWUY2vx9OMSwUSeUjZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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