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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d87fb77359488a49f03da9bcb76484d14934308af0a07044a645aa492400758' 
  AND token = 'Q8MEkzKa95q+13Otr79e95f2gAjo3WD1zBMBzkj28b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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