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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce98d25b3ede9c041f1a574225e4b8d7626d388c18f6f8e150220f187ce3ca35' 
  AND token = 'RcyawyzC3F0PI+K0AYTLXIJyvaoVwiiEZQrLn35uKpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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