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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eeacb510fa1d838f5dd2388b954c3e6e86813f8ded3d29a11e4224cc23320c0' 
  AND token = 'rP9/ZEw7tHcOsRrwl4H1S3YTX4zpDp4BfAdrxF96o+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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