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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa800fe0e72572030a0c5eced42283813df84187b0d1d2d9eb209498b8d8229' 
  AND token = 'mCHMhLWluZTBbsb0REv/c2gSV0tvMqX8FbDaDcSx7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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