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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbac99b03d5979cd6cf6b2263069286316a3fba85ac8d2b859ae2edbae0231a' 
  AND token = 'bDrQ+SLa3xatvAZOFi8ckIHVIpuA2hEvRbu9yQChpuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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