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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c28073394c1d8a55b9a43dbe5edf371a2607c130aec78c268da874bfbaeeb5a' 
  AND token = 'NZ7uQC0xA/Bln2Mmto6Uk3S2MXYmuv6cvw0u7Wk7Jak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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