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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bf6118dba285c31241598edee028ed839ccc9dd7f48dc0763d3a6af53db6eb' 
  AND token = 'EI2R5Gd/DxZdcj7cf6sYhjPh65brFHJue7uAGCVovRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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