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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1bcab8fc2ace3c8883e79bd44fc1a17c5a761367cd642cc4317765ecdcb3ff' 
  AND token = '4koy9ELTQ2EBdX6kUAaYMJuKbjrILPxa60CfXKsLVyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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