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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b3e8deca7f8de13a79caaec056c09498b8b306d7af0b9334aca8125e3fe740' 
  AND token = '/HJPujosemfXLc4Rh7apycDWeonfiNyOUapdElZ6w6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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