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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c8c324b8ab850f46da1d678b7ba491629173391a3e61bd85efb973810dabbd' 
  AND token = 'borj5DiZNufI2neKzxglUJrIxLDij+8Zr1GTclf04+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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