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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412b75c67ec62e69ef4cb6ce4be574c384a3a161d63fc17289da57fa16cafc74' 
  AND token = '7cHo6t7TEDcfITZHGCwVBS/KvMRRZ+GD+2mScZaAkxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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