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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391f317003489d6528b53ba97d0b4dd594eaada9582245d05a46c5fe4290810c' 
  AND token = 'djzpXuYdVQ0csZbXyvep4+C7xgMDRvbyewoWyAl/2BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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