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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd00c9c536f601d3430290c237a1ab0bbe528283883883d223ec000b07c9092e' 
  AND token = '58/klwiH6RcZ3wt/QgEGdfFK7VmDQXBi5Ze/+prSyPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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