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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f234b23109b322217f2ff19a9f78674d9d689198349236cbc8df02770d03ff3' 
  AND token = 'Lp19qDI/rUoftsJkhm6/M/6ntUJ31noAWo/O/Djbs/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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