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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f3c534cd33d4d62cf416b042c56e3008f1cbbdd226eca01f2dfea422e4d280' 
  AND token = 'erAKqvS3vG/Y0vmSXHSI0pCVoBan0eiJ01lP3h6qQFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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