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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d54f15cd5ea8b434e8e60a6fd06274650e0dfc3b0587127fd29f07b85dac01' 
  AND token = '2zMbE5g78bSrcTSD46B+mndNof0e8clu7E72gfsQE68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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