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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402732d19035d37d920129174065a8de8901fec27f9813b4b739e7bf6dad523f' 
  AND token = 'WYjh94XnK8yDQAh2uS0X131cbXORVe+i4e3/NfXIgTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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