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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87765d4ca180b1120229aeb63213b7790b661125d0cccf4116c4e8fc966dc96' 
  AND token = '/NrDAib9IVa1y+pqFFuSAS+KG0DYeRkjb2ZCWqhf/70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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