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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0d5788d21e66573682dabf5636fa6f43d0c7adec242bb999e863725c86af73' 
  AND token = 'gluaffmgSs4SS8ibQT3K/H6FABUd3C5o3MzUtTGtqNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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