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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac09ace94c84269064c94b1f02eeb797ea967ccfc79465e8ac5ce47b50dc0e7c' 
  AND token = 'cVScNOqwgACGToZmC3T5T5Bo45/6i0T2NEHZ6w+TY6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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