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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35e0fb3576e7f8418c017899a74a89a96db5058aeb4324300197e020fe1c2f4' 
  AND token = '7n4a/pB7q6NtFGY11XGrZZWt0XvIrUiFBp0AkZNnyjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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