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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7751340ff04073619dd1f5b8eeb6c76d2b368ad39167ad3f9cbb7106f83a474' 
  AND token = 'j3iHbphoD4fpHwphAuxiL42vICWd+lpBqrIX8bA1BMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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