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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b210c5082577261eddadb14e23b44b7a44cf994362b4ea46669de8ca92b29c3a' 
  AND token = 'aePIT6ZZrpLgNXbw9SRmCzWhfKPAjqw2qs8R/ieTYdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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