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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ae1d7af3235b4236d2cf66af6174a4ca4ca0e5d4c3fba1fe02cbaae951c6e7' 
  AND token = 'ykZPmAJLvYBd4B2XJzmo050z1gV+svDEkc1LeKeij2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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