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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a83b87776cf83099e41d9667f5e45df57e2e89982f1e25f2523dd6d84031de' 
  AND token = 'p7xc/T8lvv0QJBK59n03xwh43wc1+q6z1nDMcfRAGPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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