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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65141f76b3bfd5b332465fbef61dde1c3fc745ad76058e5af0e0d45ae0cc2ddf' 
  AND token = 'ollSw6xQON3Yr3n7LxOvBWbSEsRpGc20aTBfRplUnxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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