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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb737db6ca575aad628f233482e7efb0b8ca1c8ef584f0b0fcd9d5d9e81b719d' 
  AND token = 'hE4LvSyd4FVkfO1oa7WuOpi/HbkkJ+ABo/P1MbyMSEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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