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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fa351f823e8d2f1f0e3f041a20855de41d3dcdeffc95116471b4ee2fffe1c0' 
  AND token = '3jqW50vX2D69+ncR2hVR1VkarJDCsvRP3/SN33ozlYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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